Linux RedHat with 2 Network adapters

[elad_d]

Hi,

I have a Linux machine with 2 Network adapters on the same segment.
I have some arp problem.

eth0 - 172.28.53.151
eth1 - 172.28.53.161

when I ping the eth0 or the eth1 from a remote computer and then I do
"arp -g" I get the same mac address for both of the IPs.

it's always the mac address of eth1.
another thing is when I disable eth1 I can't access the machine at all. when I disable eth0 I can still reach the machine with eth1.
how can I fix the arp problem. ( they are 2 physical separated cards)
Thanks a lot.

Elad

[starfish]

It sounds as if one NIC is proxying for the IP other.
You may need to disable proxy arp on both interfaces. This is usually the default, but you can force it by making the proxy_arp files have a single "0" inside them instead of a "1".

echo 0 > /proc/sys/net/ipv4/conf/eth0/proxy_arp
echo 0 > /proc/sys/net/ipv4/conf/eth1/proxy_arp

You may also need to clear the arp tables of all the other servers and routers on the network.

[elad_d]

Thanks! it worked

[starfish]

Remember to put the statements in your /etc/rc.local file so that they will still remain in effect after your next reboot.